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The 5G air interface, namely, dynamic multiple access (MA) based on multiusersuperposition transmission (MUST) and orthogonal multiple access (OMA), mayrequire complicated scheduling and heavy signaling overhead. To address thesechallenges, we propose a a unified MA scheme for future cellular networks,which we refer to as structured multiuser superposition transmission (S-MUST).In S-MUST, we apply complex power allocation coefficients (CPACs) overmultiuser legacy constellations to generate a composite constellation. Inparticular, the in-phase (I) and quadrature (Q) components of the legacyconstellation of each user are separately multiplied by those of the CPACs. Assuch, the CPACs offer an extra degree of freedom for multiplexing users andguarantee fairness in symmetric broadcast channels. This new paradigm ofsuperposition coding allows us to design IQ separation at the user side, whichsignificantly reduces the decoding complexity without degrading performance.Hence, it supports low-complexity frequency-selective scheduling that does notentail dynamically switching between MUST and OMA. We further propose toquantize the CPACs into complex numbers where I and Q components of eachquantized coefficient are primes, facilitating parallel interferencecancellation at each user via modulo operations, last but not least, wegeneralize the design of S-MUST to exploit the capabilities of multiantennabase stations. The proposed S-MUST exhibits an improved user fairness withrespect to conventional MUST (134% spectral efficiency enhancement) and a lowersystem complexity compared with dynamically alternating MUST and OMA.

Enhanced Multiuser Superposition Transmission through Structured Modulation